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Rapid thermal annealing effect on surface of LiNi1−xCoxO2 cathode film for thin-film microbattery by Han-Ki Kim; Tae-Yeon Seong; Won il Cho; Young Soo Yoon is a Engineering article available to read on EtoBox.

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The effect of rapid thermal annealing (RTA) on the surface of a LiNi 1Àx Co x O 2 cathode film is examined by means of scanning electron microscopy (SEM), atomic force microscopy (AFM) and auger electron spectroscopy (AES). It is found that the as-deposited LiNi 1Àx Co x O 2 film undergoes a surface reaction with oxygen in the air, due to the high activity of lithium in the film. AES spectra indicate that the surface layer consists of lithium and oxygen atoms. The RTA process at 500 8C eliminates the surface layer to some extent. An increase in annealing temperature to 700 8C results in complete elimination of the surface layer. The surface evolution of the LiNi 1Àx Co x O 2 film with increasing annealing time at 700 8C is examined by means of AFM examination. It is found that the surface layer, which is initially present in the form of an amorphous like-film, becomes agglomerated and then vaporizes after 5 min of annealing. A thin-film microbattery (TFB), fabricated by using the LiNi 1Àx Co x O 2 film without a surface layer, exhibits more stable cycliability and a higher specific discharge capacity of 60.2 mAh cm À2 mm than a TFB with an unannealed LiNi 1Àx Co x O 2 film. Therefo

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Author

Han-Ki Kim; Tae-Yeon Seong; Won il Cho; Young Soo Yoon

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-7753)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)